package net.oschina.gitapp.common;

import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;
import java.text.DecimalFormat;
import net.oschina.gitapp.AppContext;
import net.oschina.gitapp.AppException;
import net.oschina.gitapp.R;
import net.oschina.gitapp.bean.Update;
import android.annotation.SuppressLint;
import android.app.AlertDialog;
import android.app.Dialog;
import android.app.ProgressDialog;
import android.app.AlertDialog.Builder;
import android.content.Context;
import android.content.Intent;
import android.content.DialogInterface;
import android.content.DialogInterface.OnClickListener;
import android.content.DialogInterface.OnCancelListener;
import android.content.pm.PackageInfo;
import android.content.pm.PackageManager.NameNotFoundException;
import android.net.Uri;
import android.os.Environment;
import android.os.Handler;
import android.os.Message;
import android.view.LayoutInflater;
import android.view.View;
import android.widget.ProgressBar;
import android.widget.TextView;
import android.widget.Toast;

/**
 * 应用程序更新工具包
 * 
 * @author liux (http://my.oschina.net/liux)
 * @version 1.1
 * @created 2012-6-29
 */
@SuppressLint("HandlerLeak")
public class UpdateManager {
    
    private static final int DOWN_NOSDCARD = 0;
    private static final int DOWN_UPDATE = 1;
    private static final int DOWN_OVER = 2;
    
    private static final int DIALOG_TYPE_LATEST = 0;
    private static final int DIALOG_TYPE_FAIL = 1;
    
    private static UpdateManager updateManager;
    
    private Context mContext;
    // 通知对话框
    private Dialog noticeDialog;
    // 下载对话框
    private Dialog downloadDialog;
    // '已经是最新' 或者 '无法获取最新版本' 的对话框
    private Dialog latestOrFailDialog;
    // 进度条
    private ProgressBar mProgress;
    // 显示下载数值
    private TextView mProgressText;
    // 查询动画
    private ProgressDialog mProDialog;
    // 进度值
    private int progress;
    // 下载线程
    private Thread downLoadThread;
    // 终止标记
    private boolean interceptFlag;
    // 提示语
    private String updateMsg = "";
    // 返回的安装包url
    private String apkUrl = "";
    // 下载包保存路径
    private String savePath = "";
    // apk保存完整路径
    private String apkFilePath = "";
    // 临时下载文件路径
    private String tmpFilePath = "";
    // 下载文件大小
    private String apkFileSize;
    // 已下载文件大小
    private String tmpFileSize;
    
    private int curVersionCode;
    private Update mUpdate;
    
    private Handler mHandler = new Handler() {
        public void handleMessage(Message msg) {
            switch (msg.what) {
                case DOWN_UPDATE:
                    mProgress.setProgress(progress);
                    mProgressText.setText(tmpFileSize + "/" + apkFileSize);
                    break;
                case DOWN_OVER:
                    downloadDialog.dismiss();
                    installApk();
                    break;
                case DOWN_NOSDCARD:
                    downloadDialog.dismiss();
                    Toast.makeText(mContext, "无法下载安装文件，请检查SD卡是否挂载",
                            Toast.LENGTH_SHORT).show();
                    break;
            }
        };
    };
    
    public static UpdateManager getUpdateManager() {
        if (updateManager == null) {
            updateManager = new UpdateManager();
        }
        updateManager.interceptFlag = false;
        return updateManager;
    }
    
    /**
     * 显示'已经是最新'或者'无法获取版本信息'对话框
     */
    private void showLatestOrFailDialog(int dialogType) {
        if (latestOrFailDialog != null) {
            // 关闭并释放之前的对话框
            latestOrFailDialog.dismiss();
            latestOrFailDialog = null;
        }
        AlertDialog.Builder builder = new Builder(mContext);
        builder.setTitle("系统提示");
        if (dialogType == DIALOG_TYPE_LATEST) {
            builder.setMessage("您当前已经是最新版本");
        }
        else if (dialogType == DIALOG_TYPE_FAIL) {
            builder.setMessage("无法获取版本更新信息");
        }
        builder.setPositiveButton("确定", null);
        latestOrFailDialog = builder.create();
        latestOrFailDialog.show();
    }
    
    /**
     * 获取当前客户端版本信息
     */
    private void getCurrentVersion() {
        try {
            PackageInfo info = mContext.getPackageManager().getPackageInfo(
                    mContext.getPackageName(), 0);
            curVersionCode = info.versionCode;
        }
        catch (NameNotFoundException e) {
            e.printStackTrace(System.err);
        }
    }
    
    /**
     * 检查App更新
     * 
     * @param context
     * @param isShowMsg
     *            是否显示提示消息
     */
    public void checkAppUpdate(Context appContext, final boolean isShowMsg) {
        this.mContext = appContext;
        getCurrentVersion();
        if (isShowMsg) {
            if (mProDialog == null) {
                mProDialog = ProgressDialog.show(mContext, null, "正在检测，请稍后...",
                        true, true);
                mProDialog.setCanceledOnTouchOutside(false);
            }
            else if (mProDialog.isShowing()
                    || (latestOrFailDialog != null && latestOrFailDialog
                            .isShowing()))
                return;
        }
        final Handler handler = new Handler() {
            public void handleMessage(Message msg) {
                // 进度条对话框不显示 - 检测结果也不显示
                if (mProDialog != null && !mProDialog.isShowing()) {
                    return;
                }
                // 关闭并释放释放进度条对话框
                if (isShowMsg && mProDialog != null) {
                    mProDialog.dismiss();
                    mProDialog = null;
                }
                // 显示检测结果
                if (msg.what == 1) {
                    mUpdate = (Update) msg.obj;
                    if (mUpdate != null) {
                        if (curVersionCode < mUpdate.getNum_version()) {
                            apkUrl = mUpdate.getDownload_url();
                            updateMsg = mUpdate.getDescription();
                            showNoticeDialog();
                        }
                        else if (isShowMsg) {
                            showLatestOrFailDialog(DIALOG_TYPE_LATEST);
                        }
                    }
                }
                else if (isShowMsg) {
                    showLatestOrFailDialog(DIALOG_TYPE_FAIL);
                }
            }
        };
        new Thread() {
            public void run() {
                Message msg = new Message();
                try {
                    Update update = ((AppContext) mContext
                            .getApplicationContext()).getUpdateInfo();
                    msg.what = 1;
                    msg.obj = update;
                }
                catch (AppException e) {
                    e.printStackTrace();
                }
                handler.sendMessage(msg);
            }
        }.start();
    }
    
    /**
     * 显示版本更新通知对话框
     */
    private void showNoticeDialog() {
        AlertDialog.Builder builder = new Builder(mContext);
        builder.setTitle("软件版本更新");
        builder.setMessage(updateMsg);
        builder.setPositiveButton("立即更新", new OnClickListener() {
            @Override
            public void onClick(DialogInterface dialog, int which) {
                dialog.dismiss();
                showDownloadDialog();
            }
        });
        builder.setNegativeButton("以后再说", new OnClickListener() {
            @Override
            public void onClick(DialogInterface dialog, int which) {
                dialog.dismiss();
            }
        });
        noticeDialog = builder.create();
        noticeDialog.show();
    }
    
    /**
     * 显示下载对话框
     */
    private void showDownloadDialog() {
        AlertDialog.Builder builder = new Builder(mContext);
        builder.setTitle("正在下载新版本");
        
        final LayoutInflater inflater = LayoutInflater.from(mContext);
        View v = inflater.inflate(R.layout.update_progress, null);
        mProgress = (ProgressBar) v.findViewById(R.id.update_progress);
        mProgressText = (TextView) v.findViewById(R.id.update_progress_text);
        
        builder.setView(v);
        builder.setNegativeButton("取消", new OnClickListener() {
            @Override
            public void onClick(DialogInterface dialog, int which) {
                dialog.dismiss();
                interceptFlag = true;
            }
        });
        builder.setOnCancelListener(new OnCancelListener() {
            @Override
            public void onCancel(DialogInterface dialog) {
                dialog.dismiss();
                interceptFlag = true;
            }
        });
        downloadDialog = builder.create();
        downloadDialog.setCanceledOnTouchOutside(false);
        downloadDialog.show();
        
        downloadApk();
    }
    
    private Runnable mdownApkRunnable = new Runnable() {
        @Override
        public void run() {
            try {
                String apkName = "OSChinaApp_" + mUpdate.getVersion() + ".apk";
                String tmpApk = "OSChinaApp_" + mUpdate.getVersion() + ".tmp";
                // 判断是否挂载了SD卡
                String storageState = Environment.getExternalStorageState();
                if (storageState.equals(Environment.MEDIA_MOUNTED)) {
                    savePath = Environment.getExternalStorageDirectory()
                            .getAbsolutePath() + "/OSChina/Update/";
                    File file = new File(savePath);
                    if (!file.exists()) {
                        file.mkdirs();
                    }
                    apkFilePath = savePath + apkName;
                    tmpFilePath = savePath + tmpApk;
                }
                
                // 没有挂载SD卡，无法下载文件
                if (apkFilePath == null || apkFilePath == "") {
                    mHandler.sendEmptyMessage(DOWN_NOSDCARD);
                    return;
                }
                
                File ApkFile = new File(apkFilePath);
                
                // 是否已下载更新文件
                if (ApkFile.exists()) {
                    downloadDialog.dismiss();
                    installApk();
                    return;
                }
                
                // 输出临时下载文件
                File tmpFile = new File(tmpFilePath);
                FileOutputStream fos = new FileOutputStream(tmpFile);
                
                URL url = new URL(apkUrl);
                HttpURLConnection conn = (HttpURLConnection) url
                        .openConnection();
                conn.connect();
                int length = conn.getContentLength();
                InputStream is = conn.getInputStream();
                
                // 显示文件大小格式：2个小数点显示
                DecimalFormat df = new DecimalFormat("0.00");
                // 进度条下面显示的总文件大小
                apkFileSize = df.format((float) length / 1024 / 1024) + "MB";
                
                int count = 0;
                byte buf[] = new byte[1024];
                
                do {
                    int numread = is.read(buf);
                    count += numread;
                    // 进度条下面显示的当前下载文件大小
                    tmpFileSize = df.format((float) count / 1024 / 1024) + "MB";
                    // 当前进度值
                    progress = (int) (((float) count / length) * 100);
                    // 更新进度
                    mHandler.sendEmptyMessage(DOWN_UPDATE);
                    if (numread <= 0) {
                        // 下载完成 - 将临时下载文件转成APK文件
                        if (tmpFile.renameTo(ApkFile)) {
                            // 通知安装
                            mHandler.sendEmptyMessage(DOWN_OVER);
                        }
                        break;
                    }
                    fos.write(buf, 0, numread);
                } while (!interceptFlag);// 点击取消就停止下载
                
                fos.close();
                is.close();
            }
            catch (MalformedURLException e) {
                e.printStackTrace();
            }
            catch (IOException e) {
                e.printStackTrace();
            }
            
        }
    };
    
    /**
     * 下载apk
     * 
     * @param url
     */
    private void downloadApk() {
        downLoadThread = new Thread(mdownApkRunnable);
        downLoadThread.start();
    }
    
    /**
     * 安装apk
     * 
     * @param url
     */
    private void installApk() {
        File apkfile = new File(apkFilePath);
        if (!apkfile.exists()) {
            return;
        }
        Intent i = new Intent(Intent.ACTION_VIEW);
        i.setDataAndType(Uri.parse("file://" + apkfile.toString()),
                "application/vnd.android.package-archive");
        mContext.startActivity(i);
    }
}
